Hi, The Intercept just published a few very interesting slides how the NSA intercepts H.323 (and SIP and Skype) VoIP traffic: https://firstlook.org/theintercept/document/2014/03/12/vpn-voip-exploitation... Notice how the HAMMERSTEIN component on page 4 "processes" the call signaling as man-in-the-middle. This would pretty much match the attack I have been warning about previously when I wrote "Why your AES encryption might be worth nothing". http://www.gnugk.org/h323-encryption.html Another interesting fact seems to be that they targeted H.323 and SIP before taking on Skype (bottom of page 2). Regards, Jan -- Jan Willamowius, Founder of the GNU Gatekeeper Project EMail : jan@willamowius.de Website: http://www.gnugk.org Support: http://www.willamowius.com/gnugk-support.html Relaxed Communications GmbH Frahmredder 91 22393 Hamburg Geschäftsführer: Jan Willamowius HRB 125261 (Amtsgericht Hamburg) USt-IdNr: DE286003584